package homework3;

public class A {
	public String show(D obj) {
		return ("A and D");
	}

	public String show(A obj) {
		return ("A and A");
	}

	public static void main(String[] args) {
		A a1 = new A();
		A a2 = new B();
		B b = new B();
		C c = new C();
		D d = new D();
		System.out.println(a1.show(b));
		System.out.println(a1.show(c));
		System.out.println(a1.show(d));
		System.out.println(a2.show(b));
		System.out.println(a2.show(c));
		System.out.println(a2.show(d));
		System.out.println(b.show(b));
		System.out.println(b.show(c));
		System.out.println(b.show(d));
	}
}
